[PATCH 4/6] drm/i915: Remove the vma refcount

[Thomas Hellström]

Now that i915_vma_parked() is taking the object lock on vma destruction,
and the only user of the vma refcount, i915_gem_object_unbind()
also takes the object lock,
Signed-off-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_gem.c       |  4 ----
 drivers/gpu/drm/i915/i915_vma.c       | 16 ++++------------
 drivers/gpu/drm/i915/i915_vma.h       | 14 --------------
 drivers/gpu/drm/i915/i915_vma_types.h |  1 -
 4 files changed, 4 insertions(+), 31 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 0129ed8ee09f..269bb02abf16 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -155,8 +155,6 @@ int i915_gem_object_unbind(struct drm_i915_gem_object *obj,
 		 * has a reference on the vm, so will the vm.
 		 */
 
-		/* Prevent vma being freed by i915_vma_parked as we unbind */
-		vma = __i915_vma_get(vma);
 		spin_unlock(&obj->vma.lock);
 		if (vma) {
 			bool vm_trylock = !!(flags & I915_GEM_OBJECT_UNBIND_VM_TRYLOCK);
@@ -179,8 +177,6 @@ int i915_gem_object_unbind(struct drm_i915_gem_object *obj,
 					ret = i915_vma_unbind(vma);
 				}
 			}
-
-			__i915_vma_put(vma);
 		}
 
 		spin_lock(&obj->vma.lock);
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index c5f5e893c27d..237e46d245bf 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -121,7 +121,6 @@ vma_create(struct drm_i915_gem_object *obj,
 	if (vma == NULL)
 		return ERR_PTR(-ENOMEM);
 
-	kref_init(&vma->ref);
 	vma->vm = i915_vm_get(vm);
 	vma->ops = &vm->vma_ops;
 	vma->obj = obj;
@@ -1603,16 +1602,6 @@ void i915_vma_reopen(struct i915_vma *vma)
 		__i915_vma_remove_closed(vma);
 }
 
-void i915_vma_release(struct kref *ref)
-{
-	struct i915_vma *vma = container_of(ref, typeof(*vma), ref);
-
-	i915_vm_put(vma->vm);
-	i915_active_fini(&vma->active);
-	GEM_WARN_ON(vma->resource);
-	i915_vma_free(vma);
-}
-
 static void force_unbind(struct i915_vma *vma)
 {
 	if (!drm_mm_node_allocated(&vma->node))
@@ -1637,7 +1626,10 @@ static void release_references(struct i915_vma *vma)
 
 	__i915_vma_remove_closed(vma);
 
-	__i915_vma_put(vma);
+	i915_vm_put(vma->vm);
+	i915_active_fini(&vma->active);
+	GEM_WARN_ON(vma->resource);
+	i915_vma_free(vma);
 }
 
 /**
diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h
index 67ae7341c7e0..6034991d89fe 100644
--- a/drivers/gpu/drm/i915/i915_vma.h
+++ b/drivers/gpu/drm/i915/i915_vma.h
@@ -222,20 +222,6 @@ void i915_vma_unlink_ctx(struct i915_vma *vma);
 void i915_vma_close(struct i915_vma *vma);
 void i915_vma_reopen(struct i915_vma *vma);
 
-static inline struct i915_vma *__i915_vma_get(struct i915_vma *vma)
-{
-	if (kref_get_unless_zero(&vma->ref))
-		return vma;
-
-	return NULL;
-}
-
-void i915_vma_release(struct kref *ref);
-static inline void __i915_vma_put(struct i915_vma *vma)
-{
-	kref_put(&vma->ref, i915_vma_release);
-}
-
 void i915_vma_destroy_locked(struct i915_vma *vma);
 void i915_vma_destroy(struct i915_vma *vma);
 
diff --git a/drivers/gpu/drm/i915/i915_vma_types.h b/drivers/gpu/drm/i915/i915_vma_types.h
index 88370dadca82..d8efce00d7d8 100644
--- a/drivers/gpu/drm/i915/i915_vma_types.h
+++ b/drivers/gpu/drm/i915/i915_vma_types.h
@@ -211,7 +211,6 @@ struct i915_vma {
 	 * handles (but same file) for execbuf, i.e. the number of aliases
 	 * that exist in the ctx->handle_vmas LUT for this vma.
 	 */
-	struct kref ref;
 	atomic_t open_count;
 	atomic_t flags;
 	/**
-- 
2.34.1